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Supplemental Financial Information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Financial Information [Line Items]  
Supplemental Financial Information
 
 
December 31,
$ in millions
 
2017
 
2016
Accounts receivable, net
 
 
 
 
Unbilled revenue
 
$
18.0

 
$
43.0

Customer receivables
 
57.8

 
73.9

Amounts due from partners in jointly-owned stations
 
19.1

 
12.7

Other
 
4.9

 
6.7

Provisions for uncollectible accounts
 
(1.1
)
 
(1.2
)
Total accounts receivable, net
 
$
98.7

 
$
135.1

 
 
 
 
 
Inventories, at average cost
 
 
 
 
Fuel and limestone
 
$
15.5

 
$
38.9

Plant materials and supplies
 
8.5

 
36.6

Other
 
0.5

 
1.7

Total inventories, at average cost
 
$
24.5

 
$
77.2
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the years ended December 31, 2017, 2016 and 2015 are as follows:
Details about Accumulated Other Comprehensive Income / (Loss) Components
 
Affected line item in the Consolidated Statements of Operations
 
Years ended December 31,
$ in millions
 
 
 
2017
 
2016
 
2015
Gains and losses on Available-for-sale securities activity (Note 5):
 
 
 
 
 
 
 
 
Other deductions
 
$
(0.1
)
 
$
—

 
$
—

 
 
Income tax expense / (benefit) from continuing operations
 
—

 
—

 
—

 
 
Net of income taxes
 
(0.1
)
 
—

 
—

 
 
 
 
 
 
 
 
 
Gains and losses on cash flow hedges (Note 6):
 
 
 
 
 
 
 
 
Interest expense
 
(1.0
)
 
(1.0
)
 
(1.1
)
 
 
Revenues
 
(15.2
)
 
(55.3
)
 
(18.7
)
 
 
Net purchased power cost
 
3.8

 
9.9

 
4.4

 
 
Total before income taxes
 
(12.4
)
 
(46.4
)
 
(15.4
)
 
 
Income tax expense / (benefit) from continuing operations
 
4.4

 
16.7

 
5.4

 
 
Net of income taxes
 
(8.0
)
 
(29.7
)
 
(10.0
)
 
 
 
 
 
 
 
 
 
Amortization of defined benefit pension items (Note 10):
 
 
 
 
 
 
 
 
Operation and maintenance
 
1.5

 
1.6

 
0.4

 
 
Income tax expense / (benefit) from continuing operations
 
(0.5
)
 
(0.6
)
 
(0.2
)
 
 
Net of income taxes
 
1.0

 
1.0

 
0.2

 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(7.1
)
 
$
(28.7
)
 
$
(9.8
)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the years ended December 31, 2017 and 2016 are as follows:
$ in millions
 
Gains / (losses) on available-for-sale securities
 
Gains / (losses) on cash flow hedges
 
Change in unfunded pension obligation
 
Total
Balance at December 31, 2015
 
$
0.4

 
$
26.7

 
$
(9.7
)
 
$
17.4

 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
0.2

 
16.1

 
(4.7
)
 
11.6

Amounts reclassified from accumulated other comprehensive income / (loss)
 
—

 
(29.7
)
 
1.0

 
(28.7
)
Net current period other comprehensive income / (loss)
 
0.2

 
(13.6
)
 
(3.7
)
 
(17.1
)
 
 
 
 
 
 
 
 
 
Balance at December 31, 2016
 
0.6

 
13.1

 
(13.4
)
 
0.3

 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
0.5

 
9.6

 
(2.5
)
 
7.6

Amounts reclassified from accumulated other comprehensive income / (loss)
 
(0.1
)
 
(8.0
)
 
1.0

 
(7.1
)
Net current period other comprehensive income / (loss)
 
0.4

 
1.6

 
(1.5
)
 
0.5

 
 
 
 
 
 
 
 
 
Balance at December 31, 2017
 
$
1.0

 
$
14.7

 
$
(14.9
)
 
$
0.8
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]
Operating expenses - other generally includes gains or losses on asset sales or dispositions, insurance recoveries, gains or losses on the sale of businesses and other expense or income from miscellaneous transactions. The components are summarized as follows:
 
 
Years ended December 31,
$ in millions
 
2017
 
2016
 
2015
Write-off of plant materials and supplies inventories
 
$
16.2

 
$
—

 
$
—

Gain on sale of business
 
(14.0
)
 
—

 
—

Insurance recoveries
 
(8.7
)
 
(0.7
)
 
—

Loss / (gain) on disposition of property
 
—

 
(0.1
)
 
0.4

Other
 
(0.1
)
 
0.7

 
—

Net other expense / (income)
 
$
(6.6
)
 
$
(0.1
)
 
$
0.4
THE DAYTON POWER AND LIGHT COMPANY [Member]  
Supplemental Financial Information [Line Items]  
Supplemental Financial Information
Supplemental Financial Information
 
 
December 31,
$ in millions
 
2017
 
2016
Accounts receivable, net
 
 
 
 
Unbilled revenue
 
$
18.0

 
$
43.0

Customer receivables
 
44.2

 
45.9

Amounts due from partners in jointly-owned stations
 
5.0

 
4.0

Other
 
4.7

 
8.1

Provisions for uncollectible accounts
 
(1.1
)
 
(1.2
)
Total accounts receivable, net
 
$
70.8

 
$
99.8

 
 
 
 
 
Inventories, at average cost
 
 
 
 
Plant materials and supplies
 
$
6.9

 
$
6.9

Other
 
0.4

 
2.4

Total inventories, at average cost
 
$
7.3

 
$
9.3
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the years ended December 31, 2017, 2016 and 2015 are as follows:
Details about Accumulated Other Comprehensive Income / (Loss) Components
 
Affected line item in the Statements of Operations
 
Years ended December 31,
$ in millions
 
 
 
2017
 
2016
 
2015
Gains and losses on Available-for-sale securities activity (Note 5):
 
 
 
 
 
 
 
 
Other deductions
 
$
(0.1
)
 
$
—

 
$
—

 
 
Income tax expense from continuing operations
 
—

 
—

 
—

 
 
Net of income taxes
 
(0.1
)
 
—

 
—

 
 
 
 
 
 
 
 
 
Gains and losses on cash flow hedges (Note 6):
 
 
 
 
 
 
 
 
Interest expense
 
(0.9
)
 
(1.0
)
 
(1.1
)
 
 
Income tax expense from continuing operations
 
0.2

 
0.2

 
0.2

 
 
Loss from discontinued operations
 
(8.5
)
 
(45.4
)
 
(14.3
)
 
 
Income tax benefit from discontinued operations

 
3.0

 
16.2

 
5.4

 
 
Net of income taxes
 
(6.2
)
 
(30.0
)
 
(9.8
)
 
 
 
 
 
 
 
 
 
Amortization of defined benefit pension items (Note 9):
 
 
 
 
 
 
 
 
Operation and maintenance
 
6.8

 
7.7

 
5.6

 
 
Income tax expense from continuing operations
 
(2.3
)
 
(1.8
)
 
(1.9
)
 
 
Net of income taxes
 
4.5

 
5.9

 
3.7

 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(1.8
)
 
$
(24.1
)
 
$
(6.1
)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the years ended December 31, 2017 and 2016 are as follows:
$ in millions
 
Gains / (losses) on available-for-sale securities
 
Gains / (losses) on cash flow hedges
 
Change in unfunded pension obligation
 
Total
Balance at December 31, 2015
 
$
0.5

 
$
11.2

 
$
(40.4
)
 
$
(28.7
)
 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
0.2

 
16.1

 
(6.0
)
 
10.3

Amounts reclassified from accumulated other comprehensive income / (loss)
 
—

 
(30.0
)
 
5.9

 
(24.1
)
Net current period other comprehensive income / (loss)
 
0.2

 
(13.9
)
 
(0.1
)
 
(13.8
)
 
 
 
 
 
 
 
 
 
Balance at December 31, 2016
 
0.7

 
(2.7
)
 
(40.5
)
 
(42.5
)
 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
0.5

 
12.4

 
(2.7
)
 
10.2

Amounts reclassified from accumulated other comprehensive income / (loss)
 
(0.1
)
 
(6.2
)
 
4.5

 
(1.8
)
Net current period other comprehensive income
 
0.4

 
6.2

 
1.8

 
8.4

 
 
 
 
 
 
 
 
 
Transfer of generation assets to subsidiary of parent
 
—

 
(2.1
)
 
—

 
(2.1
)
 
 
 
 
 
 
 
 
 
Balance at December 31, 2017
 
$
1.1

 
$
1.4

 
$
(38.7
)
 
$
(36.2
)